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- W2006128230 abstract "We have previously prepared beta-lactoglobulin (beta-LG)-carboxymethyl dextran (CMD) conjugates with water-soluble carbodiimide and achieved reduced immunogenicity of beta-LG. In the present study, to elucidate the mechanism for the reduced immunogenicity of beta-LG, we investigated changes in the T cell response to beta-LG after conjugation with CMDs differing in molecular weight (about 40 and 162 kDa). Lymph node cells from BALB/c, C3H/He, and C57BL/6 mice that had been immunized with beta-LG or the conjugates were stimulated with beta-LG, and the in vivo T cell response was then evaluated by BrdU (5-bromo-2'-deoxyuridine) ELISA as the ex vivo proliferative response. T cells from the conjugate-immunized mice showed a lower proliferative response than those from the beta-LG-immunized mice. T cell epitope scanning, using synthesized peptides, showed that the T cell epitope profiles of the conjugates were similar to those of beta-LG, whereas the proliferative response to each epitope was reduced. These results indicate that the lower in vivo T cell response with the conjugates was not due to induction of conjugate-specific T cells, but due to a decrease in the number of beta-LG-specific T cells. After the lymph node cells from beta-LG-immunized mice had been stimulated with beta-LG or the conjugates, the efficiency of the antigen presentation of the conjugate to beta-LG-specific T cells was evaluated by BrdU ELISA as the in vitro proliferative response. The antigen presentation of beta-LG to the T cells was reduced by conjugation with CMD. In addition, conjugation with CMD enhanced the resistance of beta-LG to cathepsin B and cathepsin D, which suggest that conjugation with CMD inhibited the degradation of beta-LG by proteases in APC and led to suppression of the generation of antigenic peptides including T cell epitopes from beta-LG. It is therefore considered that the suppressive effect on the generation of T cell epitopes reduced the antigen presentation of the conjugates and that this reduction led to a decrease in the number of beta-LG-specific T cells in vivo. As a result, the decreased help to B cells by T cells would have reduced the antibody response to beta-LG. We conclude that suppression of the generation of T cell epitopes by conjugation with CMD is important to the mechanism for the reduced immunogenicity of beta-LG." @default.
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- W2006128230 date "2002-12-17" @default.
- W2006128230 modified "2023-10-14" @default.
- W2006128230 title "Modulation of the T Cell Response to β-Lactoglobulin by Conjugation with Carboxymethyl Dextran" @default.
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- W2006128230 doi "https://doi.org/10.1021/bc020050o" @default.
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